New maps picture perfect

Take the twisting lines of contour and iconography of a United States Geological Survey (USGS) topographical map, blend in a high-resolution aerial photograph, and you’ll get a TopoPhoto, a new type of map from MyTopo.com.

This hybrid feat of cartography, announced by MyTopo.com earlier this year, is possible because of new government-issue color aerial photographs taken between 2003 and 2006.

Instead of traditional color-coded vegetation boundaries and blue swaths of ink for water, a PhotoTopo map presents area geography as it’s seen from above. Forests are discernible as bushy bunches of trees. Rivers are winding dark lines.

On top of this picture MyTopo.com overlays lines of contour, elevation markings, place names, municipal boundaries, and, if desired, latitude/longitude or UTM tic marks and grids for navigation.

The resulting map can be difficult to comprehend at first glance, as the details from the underlying aerial photograph trumped the map markings for attention.

On a regular topo map, areas of minor detail — say a large meadow — are connoted via a single shade of ink. But on a PhotoTopo map these same low-detail regions might be a mess of colors, with crisscrossing lines, amorphous blobs, and other shapes showing varying vegetation types.

But this attention to detail is the whole point of a PhotoTopo map.

Hunters, as one example, might do a better job of scouting ground cover, vegetation density or new water sources seen on the aerial photograph.

Also, because these maps use recently-taken color photographs, new details show up that are absent from same-area USGS maps.

MyTopo.com sells PhotoTopo maps for most of the United States, including all of Washington, Idaho and Montana.

As with all MyTopo.com products, the maps are customizable on the Web site, where users pick a location, the map’s size and scale, paper type, and other details. It’s a fun and easy process.

But it’s not cheap. Pricing starts at $24.95 for an 18 x 24-inch PhotoTopo map, ranging up to as much as $71.95 for a laminated 36 x 48-inch beauty ready to be used in the field or mounted and framed.